Hydrangea plant named ‘COUHAMINT’

ABSTRACT

A new and distinct cultivar of Hydrangea plant named ‘COUHAMINT’ is disclosed, characterized by globular-shaped panicles with flowers that age from green to green-white, to white. Plants have compact, v-shaped habits and brown stems. The new variety is a Hydrangea, typically produced as an outdoor ornamental plant.

Latin name of the genus and species: Hydrangea x paniculata.

Variety denomination: ‘COUHAMINT’.

BACKGROUND OF THE INVENTION

The new cultivar is a product of a planned breeding program conducted by the inventor in Vosges, France. The objective of the breeding program was to produce new Hydrangea varieties with compact plant habits and panicles with green sterile flowers. The crossing resulting in the new variety was made during 2010.

The seed and pollen parents cannot be identified as seed was bulk collected.

The new variety was found and selected by the inventor in 2012 at the same nursery in Vosges, France. Asexual reproduction of the new cultivar ‘COUHAMINT’ was first performed during 2012 in Vosges, France, by softwood cuttings. Through subsequent propagation, multiple additional generations have been reproduced, having shown that the unique features of this cultivar are stable and reproduced true to type.

SUMMARY OF THE INVENTION

The cultivar ‘COUHAMINT’ has not been observed under all possible environmental conditions. The phenotype may vary somewhat with variations in environment such as temperature, day length, and light intensity, without, however, any variance in genotype.

The following traits have been repeatedly observed and are determined to be the unique characteristics of ‘COUHAMINT.’ These characteristics in combination distinguish ‘COUHAMINT’ as a new and distinct Hydrangea cultivar:

-   -   1. Globular shaped panicles.     -   2. Flowers age from green to green-white, to white.     -   3. Brown stem color.     -   4. Compact, v-shaped plant.

PARENT COMPARISON

Comparison cannot be made to the parent varieties are they cannot be identified.

COMMERCIAL COMPARISON

Plants of the new cultivar Hydrangea ‘COUHAMINT’ can be compared to the commercial variety Hydrangea ‘Limelight’, U.S. Plant Pat. No. 12,874. Plants of ‘COUHAMINT’ are similar to plants of ‘Limelight’ in most horticultural characteristics, however, plants of ‘COUHAMINT’ differ in the following:

-   -   1. Flower panicles of the new variety are more globular than the         conical flower panicles of this comparator.     -   2. Plants of the new variety are more compact and bushy compared         to the larger, more vigorous plants of this comparator.     -   3. Flower color of the new variety is a stronger green than         flower color of this comparator.

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

The accompanying photographs illustrate typical plants of ‘COUHAMINT’ grown outdoors in Vosges, France. Plants are approximately 2-3 years old, grown in the ground in a trial field. The Figures illustrate inflorescences of the new variety at different stages of maturity. The photographs were taken using conventional techniques and although colors may appear different from actual colors due to light reflectance it is as accurate as possible by conventional photographic techniques.

FIG. 1 illustrates a plant of ‘COUHAMINT’ with inflorescences in the earliest stage of maturity, taken during the first week of July of 2020 in bright sunlight.

FIG. 2 illustrates a plant of ‘COUHAMINT’ with inflorescences in the semi-mature stage of maturity. This photo was taken in late July.

FIG. 3 illustrates in full color a close up of a mature inflorescence of ‘COUHAMINT’, with the photo taken during the end of August.

FIG. 4 illustrates in full color a close up of an inflorescence of ‘COUHAMINT’ at the most mature stage, with the photo taken during the first week of October 2019.

DETAILED BOTANICAL DESCRIPTION

In the following description, color references are made to The Royal Horticultural Society Colour Chart 2007, except where general terms of ordinary dictionary significance are used. The following observations and measurements describe ‘COUHAMINT’ plants grown in a ploy-greenhouse in Vosges, France. The plants were about 2 to 3 years old. Temperatures ranged from 5° C. to 10° C. at night to 18° C. to 27° C. during the day. No artificial light, photoperiodic treatments were given to the plants. Measurements and numerical values represent averages of typical plant types.

-   Botanical classification: Hydrangea x paniculata ‘COUHAMINT’.

PROPAGATION

-   Typical method: Softwood cuttings. -   Root initiation: 20 days at 20° C. during summer. -   Time to produce rooted cutting: About 2 months at 20° C. during     summer. -   Roots: Dense, freely branching, fibrous, thick to thin. Creamy white     to brown in color, not accurately measured with RHS chart.

PLANT

-   Growth habit: Upright, v-shaped, compact. -   Height: 70 to 80 cm. -   Plant spread: 60 cm. -   Pot size of plant described: 2 gallon container. -   Age of plant described: Approximately 2 years. -   Growth rate: Good. -   Plant vigor: Moderately vigorous. -   Stem:     -   -   Branching.—Basal.         -   Number of lateral branches.—10.         -   Shape.—Rounded.         -   Color.—Immature: RHS Yellow-Green 145A. Mature: RHS Brown             200D with Grey-Brown 199D lenticels.         -   Length.—60 cm.         -   Width.—6 mm.         -   Aspect.—70 to 80°.         -   Strength.—Strong with some flexibility.         -   Pubescence.—None.         -   Internode length.—5 cm to 10 cm.

FOLIAGE

-   Leaf:     -   -   Arrangement.—Whorl (3 leaves equally spaced around each             node).         -   Shape.—Broad elliptic to somewhat rounded deltate.         -   Length.—12 to 14 cm.         -   Width.—5.5 to 6.5 cm.         -   Apex.—Acute.         -   Base.—Obtuse.         -   Margin.—Serrulate.         -   Texture of top surface.—Roughly textured with coarse,             bristly hairs.         -   Texture of bottom surface.—Roughly textured with coarse,             bristly hairs and pronounced venation.         -   Pubescence.—Yes, both sides.         -   Color.—Young foliage upper side: RHS Green 143A. Young             foliage under side: RHS Green 143C. Mature foliage upper             side: RHS Green 141A Mature foliage, under side: RHS Green             137A. -   Venation:     -   -   Type.—Pinnate.         -   Color.—Upper side: RHS Green 143C. Under side: Green 143D. -   Petiole:     -   -   Length.—4 cm.         -   Width.—4 mm.         -   Color.—RHS Green 143D.         -   Texture.—Lightly pubescent.

INFLORESCENCE

-   Natural flowering season: Summer. -   Inflorescence type: Mophead. -   Panicle:     -   -   Shape.—Globular.         -   Height.—15 to 20 cm.         -   Diameter.—15 to 22 cm. -   Fragrance: Faintly sweet. -   Sterile flowers:     -   -   Flowers per inflorescence.—250 to 350.         -   Aspect.—Outward.         -   Shape.—Cruciform/stellate.         -   Length.—2 cm.         -   Diameter.—2.6 cm.         -   Persistent or self-cleaning.—Persistent. -   Bud:     -   -   Length.—3 mm.         -   Diameter.—3 mm.         -   Shape.—Obovate.         -   Color.—RHS Green 143C. -   Petals:     -   -   Number per flower.—3 to 4.         -   Shape.—Elliptic.         -   Tip.—Acute.         -   Base.—Truncate.         -   Margin.—Entire.         -   Length.—3 mm.         -   Width.—2 mm.         -   Texture.—Upper side: Smooth. Under side: Smooth.         -   Color.—When Opening, Upper side: RHS Yellow-Green 150A. When             Opening, Under side: RHS Yellow-Green 150A. Fully Opened,             Upper side: RHS Green-White 157A flushed Green 143A. Fully             Opened, Under side: RHS Green-White 157A flushed Green 143A. -   Sepal:     -   -   Number per flower.—4.         -   Shape.—Ovate.         -   Tip.—Broad rounded.         -   Base.—Truncate.         -   Margin.—Entire.         -   Length.—1.5 cm.         -   Width.—8 mm.         -   Texture.—Upper side: Smooth. Under side: Smooth.         -   Color.—Earliest Stage, Upper side: RHS Yellow-Green 150A.             Earliest Stage, Under side: RHS Yellow-Green 150A.             Semi-mature, Upper side: RHS Green-White 157A flushed Green             143A. Semi-mature, Under side: RHS Green-White 157A flushed             Green 143A. Mature, Upper side: RHS White 155B tinged Yellow             4C. Mature, Under side: RHS White 155B tinged Yellow 4C.             Mature before senescence Upper side: RHS Green-White 157A.             Mature before senescence, Under side: RHS Green-White 157A. -   Pedicel:     -   -   Length.—1. cm.         -   Diameter.—2 mm.         -   Angle.—45°.         -   Strength.—Good, flexible.         -   Texture.—Lightly pubescent.         -   Color.—RHS Green-White 157A. -   Fertile flowers: Absent or highly reduced and inconspicuous.

REPRODUCTIVE ORGANS

-   Sterile flower: -   Stamens:     -   -   Number.—About 8.         -   Filament color.—RHS Green-White 157A.         -   Filament length.—2 mm. -   Anthers:     -   -   Length.—1 mm.         -   Shape.—Rounded.         -   Color.—RHS Green-White 157A.         -   Pollen.—Scant.         -   Pollen color.—RHS Yellow-White 158C. -   Pistil:     -   -   Number.—1.         -   Length.—1 mm. -   Stigma:     -   -   Shape.—Bi-lobed.         -   Color.—RHS Green-White 157A.         -   Style length.—0.5 mm.         -   Style color.—RHS Green-White 157A.

OTHER CHARACTERISTICS

-   Disease resistance: Neither resistance nor susceptibility to the     normal diseases and pests of Hydrangea has been observed. -   Drought tolerance and cold tolerance: The new cultivar can tolerate     cold temperatures to approximately −31° C. and tolerates an upper     temperature range to at least 38° C. -   Fruit/seed production: Not observed to date. 

What is claimed is:
 1. A new and distinct cultivar of Hydrangea plant named ‘COUHAMINT’ as herein illustrated and described. 